Filter bag for suction cleaners



March3, 1953 B. CORDRAY 2,630,190

FILTER BAG FOR SUCTION CLEANERS Filed Jan. 5, 1951 3 Sheets-Sheet lFig.1

INVENTOR Del-[e Cordrag ATTORNEY.

March 3, 1953 B. CORDRAY 2,530,190

FILTER BAG FOR SUCTION CLEANERS 7 Filed Jan. 5, 1951 I 3 Sheets-Sheet 2INVENTOR. Belle COYdJCLIJ BY ATTORNEY.

March 3, 1953 Filed Jan.

B. CORDRAY FILTER BAG FOR SUCTION CLEANERS 3 Sheets-Sheet 3 INVENTOR.Belle COT'CLT'CLIJ Patented Mar. 3, 1953 FILTER BAG FOR SUCTION CLEANERSBelle Cordray, Canton, Ohio, assignor to The Hoover Company, NorthCanton, Ohio, a corporation of Ohio Application January 5, 1951, SerialNo. 204,617

2 Claims. (Cl. 183-51) This invention relates to a dirt filtering bagfor suction cleaners and more particularl to a simplified structure andmethod of making the bag.

Filter bags at present embodied in tank type suction cleaners are formedfrom two pieces of material, one for the cylindrical wall and the otherfor the closed end wall. It has been the practice to first sew thelongitudinal edges forming the cylindrical side Wall and thereafterstitch the end wall to one edge of the annular side wall. The secondsewing operation requires constant rotation of the end wall and thecylindrical wall with respect to the needle station in order to form theannular seam. During this operation the operator can stitch only a smallportion of the annular seam and the sewing machine must be stopped andstarted several times to adjust the material for each short stitchingoperation before completing the annular seam between the end wall andside wall of the bag.

It is therefore an object of the invention to provide a filter bag toreduce the sewing time and also the handling between successivestitching operations. Another object is to provide a filter bag bysewing the side wall material to the end wall material and thereafterstitching the side wall into cylindrical form. A further object is toprovide a filter bag by so cutting the end wall that the blanks formingthe bag are more easily manipulated with respect to the needle stationduring the sewing operation. A further object is to provide a filter bagby cutting a radial slit in the end wall material to permit the sewingof one end of the side wall material to the end wall in substantiallyone continuous stitching operation, and thereafter securing the slit andlongitudinal edges of the side wall together in substantially onestitching operation. Another object is to provide an improved filter bagfor suction cleaners. Gther objects and advantages of the invention willbe apparent from the following description and drawings, wherein Figurel is a side elevation partly in section of a tank type cleaner havingthe improved filter Figure 2 is a plan view of the two pieces ofmaterial from which the bag is made;

Figure 3 is a plan view of the material forming the bag end wallprovided with a radial out prior to sewing;

Figure 4 is a perspective view of the stitching operation attaching theside wall material to the end wall material; and

Figure 5 is a perspective view of the completed filter bag.

Figure 1 discloses a filter bag It embodied in a tank type cleanercomprising an elongated casing I I closed at its exhaust end by a cap 12having a port l3, and its inlet end is closed by a re- 2 movable'cap l4having a port 15, and the cap I4 is attached to the casing II by a latch16. The ports [3 and I5 are adapted to receive one end of a hoseprovided at its opposite end with a suitable surface cleaning tool. Thecasing is supported ona pair of skids H and is provided with a carryinghandle I8. Within the casing H is a motorfan unit l9 supported at itsopposite ends by frames 20 and 2 I, both of which are provided withopenings 22 for passage of air. The dirt filtering bag It is provided atits open end 23 with an expansible wire frame 24 for attachment to a bagring 25 removably held in position by the front end cap It. In operationof the cleaner, the bag Ii] filters the dirt from the dirt laden airstream entering the opening 15 and the cleaned air is then dischargedthrough the outlet l3.

The filter bag IE3 is made from two blanks 3i] and 3| of suitable clothor other dirt filtering fabric, the blank 39 forming the closed end walland the blank 3| providing the cylindrical side wall. The blank 31! hasa peripheral edge 35 substantially equal to the girth of the bag l0, andthe blank 3! has opposite end 3% and 31 of a length equal to theperipheral edge 35, and the longitudinal edges 33 and 39 aresubstantially the length of the completed bag It.

The first step in constructing the bag it is to cut the blank 38 asindicated at All in a radial direction to a point short of the center 4|to provide cut edges 32 and 43.

The two blanks are then placed in a sewing machine with the cut edge 42in line with the longitudinal edge 38 and the peripheral edge 35 is thenstitched to the end 35 of the blank 31 to form a seam 44. At the end ofthis sewing operation, the cut edge '33 will be alined with thelongitudinal edge 39 of the blank 3|. During this sewing operation, thecut edges 42 and 53 are spread apart to assist the operator in adjustingthe arcuate edge 35 of the blank 30 with the straight edge 3'5 of theblank 3 i. In addition, the cut 483 permits the cut edges 62 and 3 to bespread apart and prevents the blank 3! from forming a completecylindrical wall as the seam 44 is being completed near the cut edge 43,and thus does not interfere with the operators line of vision institching the last portion of the seam 44. The cut edges 52 and 43 alsopermit the end wall material to be spread apart so that the operator caneasily arrange and line up the blanks 30 and 3! as the seam 44 is beingstitched and thus reduces handling and interruptions in adjusting of thematerial during the sewing operation.

The next step comprises overlapping the longitudinal edges 38 and 39 ofthe side wall material and placing the free end 31 under the needle tostitch a seam 46 in a straight line without interruption during thesewing operation. When stitching of the seam 46 approaches the cut edge42 and 43 in the end wall 30, the operator laps the edges 42 and 43 andarranges the latter in a straight line with the sewed portion of theseam 46 to stitch an end wall seam 41 in a substantially straight linesewing operation with the side wall seam 45. If desired, an overcastingstitch may be provided at 49 and 50 to prevent raveling of the exposededges.

The bag wire clamp 24 is sewed in a hem Ii at the end of the bag by theseam 52. The wire clamp 24 is expanded by compressing its opposite ends5353 together to attach the bag on the bag ring 25 for insertion in thecleaner casing.

From the foregoing, it is apparent I have provided a filter bag whicheliminates stitching in arcuate directions and as a result reduce thenumber of interruptions to adjust the material during the sewing of eachof the seams.

While I have shown and described but one embodiment of my invention, itis to be understood that that embodiment is to be taken as illustrativeonly and not in a limiting sense. I do not wish to be limited to theparticular structure shown and described but to include all equivalentvariations except as limited by the scope of the claims.

I claim:

1. A dirt filtering bag adapted for use with a material forming the sidewall and another piece of filtering material forming the end wall 01 thebag, said end wall material secured at its periphery to the endperiphery of said side wall material, said end wall material cutinwardly from its periphery and secured together to complete the endwall of the bag, and the meeting edges of said side wall materialsecured together to complete the side wall of the bag.

2. A dirt filtering bag adapted for use with a suction cleaner,comprising one piece of filter material forming the side wall andanother piece of filtering material forming the end wall of the bag,said end wall material cut inwardly from its periphery, the originalperiphery of said end wall secured to the end of said side wallmaterial, the meeting edges of said cut end wall and the meeting edgesof said side wall material secured together to complete the bottom andside walls of the bag.

BELLE CORDRAY.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 2,129,105 Spence Sept. 6, 19382,174,730 White Oct. 3, 1939 2,268,352 Taylor Dec. 30, 1941 2,364,069Hahn Dec. 5, 1944

